BlueYonder Cracking Down on Open SMTP Relayswww.ISPreview.co.uk is reporting that Telewest is cracking down on users running SMTP servers, in particular those users who have left them configured as open relays. The problem is that if an SMTP server is left open like this any one can bounce mail via it and it appears that the Telewest IP block has been reported for these violations and hence has been listed in anti-spam lists.
Telewest say that those found running insecure mail servers will be dealt with under the providers Acceptable Use Policy. Several ADSL ISP's are known to scan for open SMTP mail relays and with Nildram you only get port 25 access on request, i.e. it's blocked until you ask for it to be open and they will then check your mail server before allowing port 25 access.